Method for the manufacture of a compound product with a surface region of a wear resistant coating, such a product and the use of a steel material for obtaining the coating

a technology of wear resistance coating and compound product, which is applied in the manufacture of compound products with wear resistance coatings, such as products, and the use of steel materials for obtaining the coating, etc., can solve the problems of macroscopic cracking of the sealing surface, the sealing surface of the valve is subjected to a slight abrasive wear, and the requirement cannot be fulfilled by a single material, so as to achieve good wear resistance

Inactive Publication Date: 2011-09-08
UDDEHOLMS AB
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0057]In this way, it will be possible to use the powder metallurgically produced steel material for products requiring very good wear resistance in the surface region of the product at the sa

Problems solved by technology

Within the technology there are often requirements which cannot be fulfilled by a single material.
During use, the sealing surfaces of the valve are subjected to a slightly abrasive wear and also to cold welding because of high surface pressures and a relative motion between the components, so called galling, which makes it necessary regularly to perform maintenance in the form of grinding, repair welding or exchange of valves.
The coating of Stellite 6 by welding may already from the beginni

Method used

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  • Method for the manufacture of a compound product with a surface region of a wear resistant coating, such a product and the use of a steel material for obtaining the coating
  • Method for the manufacture of a compound product with a surface region of a wear resistant coating, such a product and the use of a steel material for obtaining the coating
  • Method for the manufacture of a compound product with a surface region of a wear resistant coating, such a product and the use of a steel material for obtaining the coating

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fourth embodiment

[0086]According to a fourth preferred embodiment of the method, the substrate is manufactured simultaneously with the application of the wear resistant coating. This may take place by an inner capsule being filled with powder of the steel material which shall give the substrate the necessary strength / resistance. This capsule is sealed, evacuated of gas and positioned in an outer capsule, in which the powder of the wear resistant steel is put / has been put. It is realized that the amount of powder of the respective steel material and the mutual location of the inner capsule and the powder of the wear resistant steel material, respectively, is dependent on several factors, e.g. the shape of the desired compound product, the thickness of the wear layer, the thickness of the substrate and the volume change (contraction) at the pressing, and must be adapted to these factors. Thereafter, the outer capsule is sealed and evacuated of gas, and the entire unit is hot isostatically pressed. An ...

first embodiment

[0109]In principle, vanadium may be replaced by niobium to form MX-nitrides, -carbides and / or -carbonitrides, but in such a case a larger amount is required as compared to vanadium, which is a disadvantage. Further, niobium results in the nitrides, carbides and / or carbonitrides getting a more edged shape and being larger than pure vanadium nitrides, carbides and / or carbonitrides, which may initiate ruptures or chippings and hence reduce the toughness and the polishability of the material. This may be especially detrimental for the steel in those cases when the composition is optimized in order to achieve an excellent wear resistance in combination with good ductility and high hardness, as regards the mechanical properties of the material. In this case, the steel must not contain more than max. 2%, suitably max. 0.5%, preferably max. 0.1% niobium. As to production, there are also problems, as Nb(C,N) may give clogging of the tapping jet from the ladle during the atomizing. According ...

second embodiment

[0120]The steel is suitable to use where high requirements for corrosion resistance in combination with high hardness (up to 60 to 62 HRC) and good ductility as well as increasing demands for resistance against both abrasive and adhesive wear as well as galling and fretting applies. With a composition according to the table, the steel has a matrix, which after hardening from an austenitizing temperature of 950 to 1150° C. and low temperature tempering at 200 to 450° C., 2×2 h, or high temperature tempering at 450 to 700° C., 2×2 h, consists of tempered martensite with a hard phase amount consisting of up to about 10 vol.-% each of M2X, where M mainly is Cr, and X mainly is N, and of MX, where M mainly is V and Cr, and X mainly is N.

[0121]Table 5 shows the composition ranges in weight-% for a steel according to the third preferred embodiment of the invention.

TABLE 5ElementCSiMnCrMoVNMin.0.100.010.0118.00.014.01.5Guideline value0.200.300.3021.01.35.53.0Max.0.801.51.521.52.57.55.0

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Abstract

A wear resistant steel material, produced in a powder metallurgical manner, has the following composition in weight-%: and, further, 0.5 to 14 of (V+Nb/2), wherein the contents of N, on one hand, and of (V+Nb/2), on the other hand, are balanced in relation to each other so that the contents of said elements are within a range A, B, G, H, A in a perpendicular plane coordinate system, where the content of N is the abscissa and the content of V+Nb/2 is the ordinate, and where the coordinates for said points are: and max 7 of any of Ti, Zr, and Al; balance essentially only iron and unavoidable impurities. This steel is excellent for obtaining a wear resistant surface region on a substrate of a metallic material by hot isostatic pressing of the steel material of the substrate. Especially when the wear resistant steel is void of Co, the compound body obtained is especially suitable for use in e.g. valves for nuclear power plants.

Description

TECHNICAL FIELD[0001]The present invention relates to a method for the manufacture of a compound product comprising a substrate of a first metallic material giving the product the necessary strength / resistance, and a coating of a wear resistant steel material applied on a surface region of the substrate.[0002]The present invention also relates to a compound product comprising a substrate of a first metallic material giving the product the necessary strength / resistance, and a coating of a wear resistant steel material applied on a surface region of the substrate.[0003]Further, the invention relates to the use of a powder metallurgically produced steel material with a certain composition.PRIOR ART[0004]Within the technology there are often requirements which cannot be fulfilled by a single material. For instance, contemporaneous and incompatible requirements may be put on ductility / toughness and wear resistance. In order to fulfil such requirements so called compound products can be u...

Claims

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Application Information

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IPC IPC(8): B32B15/18B22F7/00B22F3/15B22F3/24B32B5/02
CPCB22F7/04Y10T428/12979B32B15/011C21D1/18C21D1/25C21D6/002C21D6/004C21D6/02C21D9/0068C21D2211/004C21D2211/008C22C33/0285C22C38/001C22C38/002C22C38/008C22C38/02C22C38/04C22C38/22C22C38/24B22F2998/00Y10T428/1266B22F3/15
Inventor SANDBERG, ODD
Owner UDDEHOLMS AB
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